Physics - November 2006

2006-11-16 11:32:01 · 3 answers · asked by John 2

Two geekie physics students with a combined mass of 146 kg jump into their old car to run out for some late night pizza. The distance between the front and back axles of the car is 2.7 m. When they get in the car, the springs compress a total of 8.9 cm. On their way to the Pizza Hut, when they go over a bump, the car oscillates up and down with a period of 1.7 seconds.

** What is the mass of the car?

2006-11-16 11:29:57 · 2 answers · asked by por_ti_a_17 2

2006-11-16 11:24:26 · 2 answers · asked by Dimitriy G 2

What is the speed required for an nuetron to cause Nuclear Fission?
____
In order for nuclear fission to occur (the splitting of a atomic nucleus), a free nuetron has to bombard the nucleus, moving at a very high speed. I was wondering, how fast?

2006-11-16 11:12:29 · 3 answers · asked by lemon drops 3

A space station is in the shape of a hollow ring with an outer diameter of 150 m. How fast should it rotate to simulate Earth's gravity--that is, so that the force exerted on an object by the outside wall is equal to the object's weight on Earth's surface?

2006-11-16 11:09:07 · 1 answers · asked by Thomas V 1

A block of mass(m) is being pulled at a constant speed(v) down a slope that makes an angle(theta) with the horizontal. The pulling force is applied through a horizontal rope, as shown below. If the coefficient of kinetic friction is Uk, find an expression for the rope tension.

2006-11-16 11:06:02 · 3 answers · asked by Thomas V 1

A police officer investigating an accident estimates from the damage done that a car hit a stationary car at 25 km/h. If the moving car left skid marks 47 m long, and if the coefficient of kinetic friction is 0.71, what was the initial speed of the moving car?

2006-11-16 11:03:24 · 2 answers · asked by Thomas V 1

Marc attaches a falling 500-kg object with a rope through a pulley to a paddle wheel shaft. He
places the system in a well-insulated tank holding 25 kg of water. When the object falls, it
causes the paddle wheel to rotate and churn the water. If the object falls a vertical distance of
100 m at constant speed, what is the temperature change of the water? (1 kcal = 4 186 J, the
specific heat of water is 4 186 J/kg°C, and g = 9.8 m/s2).

Answer: 4.7 C°

2006-11-16 11:01:08 · 2 answers · asked by master 1

2006-11-16 10:51:21 · 4 answers · asked by Not my name 2

please help me it's my hw. i really don't get it

2006-11-16 10:42:50 · 6 answers · asked by simi 2

Can a coefficient of friction exceed 1.0?????

I have no idea what this means,... please help and explian if you can.

2006-11-16 10:40:34 · 1 answers · asked by Alex M 1

2006-11-16 10:09:50 · 9 answers · asked by juicy 1

Just wondering if anyone knew the actual long hand version of this well known formula made famous by Einstein?

2006-11-16 10:03:35 · 10 answers · asked by Serendipity 1

2006-11-16 09:41:14 · 7 answers · asked by Seeker 4

On the Science channel I heard we will start making Nano-bots 20 years from now...Is it true?

2006-11-16 09:32:54 · 3 answers · asked by jkuraah 1

A constant force of 100N is applied to a mass of 40.0kg. The force causes a displacement of 20.0m to this mass along the positive x axis. Neglect friction. What is the work done by the component of the force along the positive x axis. By the way, the force is coming from and angle of 40 degrees.
Can you please show me how to do this. Thanks.

2006-11-16 09:31:43 · 2 answers · asked by bluevolleyball12 1

and how do we know it exists?

2006-11-16 09:29:34 · 8 answers · asked by ♥™ 4

2006-11-16 09:05:02 · 5 answers · asked by sarah m 1

According to Netwon's third law, each team in a tug of war pulls with equal force on the other team. What then determines which team will win?

Can someone please explain this to me?

2006-11-16 09:04:19 · 2 answers · asked by Megan M 2

2006-11-16 09:02:10 · 6 answers · asked by Anonymous

who is the best cientific of the history.

2006-11-16 08:45:27 · 21 answers · asked by gandalf 2

Consider an equal mass of water at liquid state and water vapour both at the same temperature (say 300K).
Is the internal energy of the water at liquid state higher than the internal energy of water vapour of the same temperature?
I need clear justification on this.
All i know is, internal energy of a system is defined as the sum of microscope KE and PE of the molecules in the system.
In gas such as water vapour, intermolecular forces of attraction is weak and hence it has low PE.(correct me if i'm wrong)
Since they are at the same temperature, both systems have the same KE?
So my conclusion is water in liquid is at a higher energy state. I'm very skeptical about this conclusion. A gas should be at a higher energy state....

2006-11-16 08:43:09 · 7 answers · asked by Anonymous

When jumping straight down, you can be seriously injured if you land stiff-legged. One way to avoid injury is to bend your knees upon landing to reduce the force of the impact. A 75 kg man just before contact with the ground has a speed of 6.2 m/s.

(a) In a stiff-legged landing he comes to a halt in 1.7 ms. Find the average net force that acts on him during this time.

273529.41 N

(b) When he bends his knees, he comes to a halt in 0.08 s. Find the average force now.

5812.5 N

(c) During the landing, the force of the ground on the man points upward, while the force due to gravity points downward. The average net force acting on the man includes both of these forces. Taking into account the directions of these forces, find the force of the ground on the man in parts (a) and (b). stiff legged landing and bent legged landing.

i've found a and b. just can't seem to get the force of the ground. any help?

2006-11-16 08:38:25 · 1 answers · asked by Any help? 1

its some sound related thing i know that much....

2006-11-16 08:21:05 · 4 answers · asked by anit k 1

2006-11-16 08:16:49 · 6 answers · asked by Dalim 1

The escape velocity of a bullet from the surface of planet Y is 1759.0 m/s. Calculate the escape velocity from the surface of the planet X if the mass of planet X is 1.53 times that of Y, and its radius is 0.807 times the radius of Y.

2006-11-16 08:04:49 · 1 answers · asked by Anonymous

On planet Zog, Mr. Spock measures that it takes 1.44 s for a mass of 0.3 kg to hit the ground when released from rest from a height of 2.73 m. Calculate the size of the acceleration of gravity on that planet.

He decides to repeat the experiment. Calculate the work he must do to move the mass from the ground back up to its initial height.

2006-11-16 08:04:11 · 7 answers · asked by Anonymous

2006-11-16 07:58:01 · 5 answers · asked by mason c 2

2006-11-16 07:52:07 · 4 answers · asked by Anonymous

2006-11-16 07:36:33 · 5 answers · asked by sunnypeters 1